package g34930.td6;

import java.util.Scanner ; 


public class AfficherPairS1 { 
    public static void main ( String[] args ) { 

	Scanner clavier = new Scanner ( System.in ) ;  
	int nb, n;
	n = clavier.nextInt();
	for ( nb = 2 ; nb <= n ; nb = nb + 2) {

		System.out.println(nb);

	}

    }


}
